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WO2003077017A1 - Unite d'affichage a cristaux liquides - Google Patents

Unite d'affichage a cristaux liquides Download PDF

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Publication number
WO2003077017A1
WO2003077017A1 PCT/JP2003/002984 JP0302984W WO03077017A1 WO 2003077017 A1 WO2003077017 A1 WO 2003077017A1 JP 0302984 W JP0302984 W JP 0302984W WO 03077017 A1 WO03077017 A1 WO 03077017A1
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WO
WIPO (PCT)
Prior art keywords
liquid crystal
light
crystal display
display device
viewing angle
Prior art date
Application number
PCT/JP2003/002984
Other languages
English (en)
Japanese (ja)
Inventor
Kazutaka Hara
Original Assignee
Nitto Denko Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nitto Denko Corporation filed Critical Nitto Denko Corporation
Priority to US10/507,120 priority Critical patent/US20050206804A1/en
Publication of WO2003077017A1 publication Critical patent/WO2003077017A1/fr

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133504—Diffusing, scattering, diffracting elements
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • G02F1/133607—Direct backlight including a specially adapted diffusing, scattering or light controlling members the light controlling member including light directing or refracting elements, e.g. prisms or lenses

Definitions

  • the present invention relates to a liquid crystal display device, and more particularly to a liquid crystal display device which can be thinned and has a wide viewing angle and excellent display quality.
  • the technique of making the backlight parallel light has various practical problems.
  • conventionally known backlight parallelization technology see, for example, Japanese Patent Application Laid-Open Nos. H10-333147 and H10-25555528.
  • the backlight became thicker, the light use efficiency was low, and the cost was high.
  • a region where a high contrast can be obtained is defined as ⁇ 20 It is only in the range of degrees.
  • the parallelism of the light emitted from the backlight is narrowed to within ⁇ 20 degrees, and the transmitted light near the front is diffused by the diffusion means after passing through the liquid crystal cell.
  • a prism condensing sheet for example, BEF (Brightness Enhance Film) manufactured by 3M
  • BEF Brightness Enhance Film
  • the parallelism is limited to about ⁇ 40 degrees.
  • the parallelization of light due to the shape of the light guide constituting the backlight was only about ⁇ 40 degrees, and the ability to use them as a means for expanding the viewing angle of a liquid crystal display device was insufficient.
  • Ma in an optical system such as BEF that relies on a prism effect that bends light by the difference in refractive index between the surface irregularities and air, it is impossible to laminate through an adhesive or adhesive, so the air interface must be I need. Therefore, in the assembling process, there was a problem that dust and dirt were caught in the air interface and the surface was damaged.
  • a light shielding film for example, a light control film made by 3M
  • absorption loss is large and brightness is reduced. There was a problem.
  • each light-shielding louver (a rectangular piece that is colored black and absorbs light) 5 constituting the light-shielding film 20 has a width W of 13 ⁇ m, and
  • each light-shielding louver 5 When the thickness T and the arrangement interval P of each light-shielding louver 5 are both 13 im, the maximum transmittance is 50%, and the thickness T is 35 m in order to make the parallelism of transmitted light ⁇ 20 degrees. By laminating two films 20, the thickness becomes 70 m as a whole. However, the transmittance after lamination of two sheets drops to 25%.
  • each light shielding louver 5 when the thickness T of each light shielding louver 5 is 13 ⁇ m, the arrangement interval P is 250 ⁇ , and the thickness is 100 m, the maximum transmittance is 95%, and even if two sheets are laminated, the maximum transmittance is 90%. % Can be maintained, and the total thickness is 200 im, but the parallelism of the transmitted light is about 50 degrees, which means that parallel light cannot be obtained.
  • the thickness of the parallelizing means used in a liquid crystal display device used in a notebook personal computer or a mobile phone is preferably 200 m or less, and more preferably 100 m or less. More preferred.
  • the parallel light means composed of mirrors, lenses, prisms, light guides, etc., has a remarkable increase in thickness and weight, and has not been an effective means except for special applications such as projectors.
  • a thin film-shaped parallel light conversion means capable of narrowing the emission light of the backlight within a range in which a good viewing angle characteristic of the liquid crystal display device can be obtained, that is, within about ⁇ 20 degrees, and reducing absorption loss. Is desired.
  • the display surface of the liquid crystal cell will be reduced.
  • moire fringes and interference fringes were generated between the pattern structure of the viewing angle expanding means and the pattern structure of the collimating means.
  • the pattern structure of the viewing angle enlarging means and the pattern structure of the collimating means are used.
  • moire fringes ⁇ interference fringes occurred.
  • the viewing angle enlarging means can be similarly connected to the pixel of the liquid crystal cell. Since a pattern structure with a size that does not generate moiré fringes or interference fringes is adopted, the pattern structures of both means are just large enough to generate moiré fringes or interference fringes. The same applies to the arrangement of both means (angle, arrangement, etc.), and the allowable design range is narrow from the viewpoint of preventing generation of moiré fringes and interference fringes. In other words, the range of optical systems that can be selected as both means There was a problem that was extremely narrow.
  • the hologram-based material has the effect of reducing the transmittance of the light emitted in the oblique direction by transmitting the vertically incident light and scattering the obliquely incident light. In this case, it is difficult to obtain highly directional light collection. Also, the hologram-based material is flexible and easily subjected to stress deformation, and thus has a problem of poor optical reliability.
  • the conventional liquid crystal display device provided with the collimating means and the viewing angle enlarging means has a narrow design choice due to an optical problem caused by the fine pattern structure of both means.
  • the present invention has been made in order to solve the problems of the related art, and it is an object of the present invention to provide a liquid crystal display device having a wide viewing angle and excellent display quality free from occurrence of moire fringes and interference fringes. This is the first issue.
  • a second object is to provide a liquid crystal display device that can be made thin.
  • the present invention provides a backlight, a collimating means for collimating light incident from the backlight and emitting the collimated light, and a collimating means emitted from the collimating means.
  • a liquid crystal display device comprising: a liquid crystal cell that transmits the transmitted light; and a viewing angle expanding unit that expands a viewing angle by diffusing the light transmitted through the liquid crystal cell, wherein the parallel light converting unit is arranged from a display surface side.
  • a regular pattern structure that can generate moiré fringes, interference fringes, and the like with a regular pattern structure of other optical components constituting the liquid crystal display device is not provided.
  • a feature of the present invention is to provide a liquid crystal display device.
  • the apparatus since the apparatus includes a parallel light converting unit that emits light that has been converted into a parallel light with respect to the liquid crystal cell, and a viewing angle expanding unit that expands a viewing angle by diffusing light transmitted through the liquid crystal cell.
  • a liquid crystal display device having a viewing angle is provided.
  • moire fringes and the like are generated between the collimated light and the regular pattern structure of other optical members constituting the liquid crystal display device (such as a liquid crystal cell and a viewing angle enlarging means). Since it does not have a regular pattern structure capable of generating interference fringes and the like, a liquid crystal display device having excellent display quality and free from moire fringes and interference fringes is provided.
  • the parallel light conversion means is a bandpass filter.
  • the non-pass filter is formed by, for example, laminating a plurality of vapor-deposited materials, moire fringes, interference fringes, and the like are generated between the non-pass filter and a regular pattern structure of other optical members constituting the liquid crystal display device. It does not have a regular pattern structure that can be caused. Further, since the evaporation material and the like can be made thinner, the thickness of the bandpass filter can be reduced, and the liquid crystal display device can be made thinner.
  • the bandpass filter can be formed using a cholesteric liquid crystal polymer material, or can be formed by laminating a plurality of vapor-deposited materials or by laminating resin materials having different refractive indexes. It is possible.
  • a band-pass filter is formed by laminating resin materials in multiple layers
  • the resin material is extruded in multiple layers and then stretched to form a multilayer laminate or a thin film. It is possible to perform multi-layer lamination by coating.
  • the parallelizing means has a thickness of 200 im or less, whereby the thickness of the liquid crystal display device provided with the parallelizing means can be reduced.
  • the thickness of the parallel light converting means is more preferably 100 or less, and further preferably 50 m or less.
  • the parallelism of the light emitted from the collimating means is within ⁇ 20 degrees, whereby the area where a high contrast is obtained in a normal TN liquid crystal display device can be effectively used. It is.
  • the parallelism of the light is more preferably within ⁇ 15 degrees, and further preferably within ⁇ 10 degrees.
  • the light source of the backlight has an emission line spectrum.
  • a three-wavelength cold-cathode tube, a light-emitting diode, or an electoluminescence device can be used as the light source.
  • the viewing angle enlarging means is a diffusion plate that does not substantially cause backscattering and does not substantially eliminate the polarization state.
  • the viewing angle enlarging means since the viewing angle enlarging means does not substantially cause backscattering, it is possible to prevent a decrease in transmittance due to the viewing angle enlarging means, and the polarization state is not substantially eliminated. It is possible to dispose them close to each other (for example, between the liquid crystal cell and a polarizing plate on the display surface side of the liquid crystal cell), thereby preventing the influence of blurring of pixels of the liquid crystal cell. It is possible.
  • FIG. 1 is a longitudinal sectional view showing a schematic configuration of a main part of a liquid crystal display device according to one embodiment of the present invention.
  • FIG. 2 is a diagram illustrating transmission spectral characteristics of the bandpass filter according to the first embodiment.
  • FIG. 3 is a diagram illustrating viewing angle characteristics of the liquid crystal display device according to the first embodiment.
  • FIG. 4 is a diagram illustrating transmission spectral characteristics of the bandpass filter according to the second embodiment.
  • FIG. 5 is a diagram showing viewing angle characteristics of a conventional liquid crystal display device.
  • FIG. 6 is a diagram showing a schematic configuration of a light shielding louver film as a conventional collimating means.
  • A is a perspective view
  • (b) is a plan view
  • (c) is a perspective view showing a state in which two films are laminated.
  • FIG. 7 is a diagram showing transmission spectral characteristics of the selective reflection circularly polarizing film shown in Example 3.
  • FIG. 1 is a longitudinal sectional view showing a schematic configuration of a main part of a liquid crystal display device according to one embodiment of the present invention.
  • a liquid crystal display device 10 according to the present embodiment includes a backlight 1, a parallel light converting unit 2 for converting light incident from the backlight 1 into parallel light, and outputting the parallel light.
  • a liquid crystal cell 3 for transmitting the light emitted from the converting means 2 and a viewing angle expanding means 4 for expanding the viewing angle by diffusing the light transmitted through the liquid crystal cell 3.
  • the backlight 1 is, for example, a light source having an emission line spectrum such as a light-emitting diode and an elector-emitting luminescence element in addition to a three-wavelength cold-cathode tube, and emits light in a plane to the collimating means 2. It is configured to be.
  • the knock light 1 is a so-called direct light type as shown in FIG. 1 or a so-called side light type in which a light source is arranged on the side and emitted in a plane through a light guide. It is also possible. In the optical observation from the display surface side (upper side of the paper surface of FIG.
  • the parallel light converting means 2 is used for the other optical members (such as the liquid crystal cell 3 and the viewing angle enlarging means 4) constituting the liquid crystal display device 10. It is assumed that there is no regular pattern structure that can generate moiré fringes and interference fringes with the regular pattern structure.
  • the collimating means 2 is called a bandpass filter 2).
  • the bandpass filter 2 is, for example, disclosed in Japanese Patent Application No. 2000-6005 and Japanese Patent Application No. 2000-281382, It can be formed using a cholesteric liquid crystal polymer material and utilizing the angular dependence of selective reflection of cholesteric liquid crystal. According to such a bandpass filter 2, it is possible to convert the light emitted from the backlight 1 into parallel light without causing absorption loss.
  • the same function is also achieved by depositing a vapor-deposited material or a resin material with a different refractive index on a transparent substrate. It can also be realized by a bandpass filter 2 formed by multi-layering the layers.
  • the parallelization of the light emitted from the backlight 1 using the pan-pass filter 2 has a feature that light having higher parallelism can be easily obtained as compared with the related art.
  • the light source of the backlight 1 is a light source having a bright line spectrum such as a three-wavelength cold-cathode tube
  • the transmission wavelength band of the band-pass filter 2 should be optimized according to the bright line spectrum.
  • Bandpass filter 2 is essentially a filter that does not absorb light, and the reflected non-parallel light (oblique incident light) is returned to knock light 1 and re-reflected toward bandpass filter 2.
  • the fine pattern structure in the plane is not visually recognized.
  • the black matrix (not shown) and other optical members such as a glare-treated layer (not shown) provided on the outermost surface of the liquid crystal display device 10, resulting in excellent display quality without generating moire fringes or interference fringes.
  • the thickness of the thin film layer of the bandpass filter 2 is about several m to several tens xm excluding the base material, compared to the conventional collimating means using a microlens array or a microprism array. It is easy to design for thinning. Also, since it does not require an air interface, it can be used by attaching it to a backlight 1 or the like. Can offer significant advantages in terms of handling.
  • a band-pass filter using a cholesteric liquid crystal polymer as a material two ordinary stretched films (thickness: 50 m) are used as a retardation plate to be combined with the material, and these are adhered. Even when laminated with materials, the total thickness is about 150 m. If the retardation plate is formed of a liquid crystal polymer material and the respective layers are directly bonded, the thickness can be reduced to about 50 m. In the case of a bandpass filter using a vapor deposition material, 2, the thickness can be reduced to about 3 m excluding the base material.
  • the viewing angle enlarging means 4 diffuses the light having good display characteristics near the front obtained by the parallel light converting means 2 after passing through the liquid crystal cell 3 to obtain uniform and good display quality within the entire viewing angle.
  • various forms can be applied as long as it is a diffusion plate having a function of diffusing light, but Japanese Patent Application Laid-Open No. 2000-3470706 and It is preferable to use a diffusion plate (diffusion adhesive layer) which does not substantially cause backscattering as disclosed in Japanese Patent Application Laid-Open No. 2000-34707.
  • the liquid crystal display device 10 having such characteristics is used for DTP (desktop publishing), which is often viewed by changing the orientation of the liquid crystal display device 10 and changing the vertical and horizontal directions of the display screen, as well as digital cameras and video. It is suitable as a liquid crystal display device such as a camera.
  • the viewing angle enlarging means 4 can be arranged on any of the front and back surfaces of a polarizing plate (not shown) arranged on the display surface side of the liquid crystal cell 3 as long as it is on the display surface side of the liquid crystal cell 3.
  • the distance between the polarizing plate and the liquid crystal cell 3 that is, the back side of the polarizing plate
  • the viewing angle enlarging means 4 does not substantially eliminate the polarization state. It is preferable to use, for example, It is preferable to use a fine particle-dispersed diffusion plate (diffusion adhesive layer) (about 80% to 90% haze) as disclosed in JP-A-347006 and JP-A-2000-347007.
  • the viewing angle enlarging means 4 it is also possible to adopt a conventional microlens array film or a hologram film having a regular pattern structure inside.
  • a pattern between a black matrix constituting a liquid crystal display device and a microlens array, a prism array, a light shielding louver, a micromirror array, etc. constituting a conventional collimating means is used. Moire fringes and interference fringes were likely to occur.
  • the band-pass filter 2 as the parallel light unit according to the present embodiment is capable of reducing the light emitted from the band-pass filter 2 without observing a fine in-plane fine pattern.
  • any form can be selected as the viewing angle expanding means 4 as long as moire fringes and interference fringes do not occur between the optical member (black matrix or the like) other than the collimating means 4. .
  • the vertical, horizontal, and horizontal viewing angle characteristics are selected. For example, it is suitable as a liquid crystal display device of a horizontally long screen television.
  • bandpass filter 2 will be described in detail.
  • the bandpass filter 2 is formed by multi-layer lamination by vacuum evaporation, sputtering, electron beam co-evaporation (EB), resin thin film coating, or the like, using a stretched film of a multi-layer extruded resin material, or These bandpass-filled laminates are formed into a scale by crushing the flakes, and the crushed pieces are embedded in a resin.
  • EB electron beam co-evaporation
  • the bandpass filter 2 can be formed by stacking.
  • halogenated resins represented by polyethylene naphthalate, polyethylene terephthalate, polycarbonate, biercarbazole, and brominated acrylate
  • High refractive index resin material such as a composition, a high refractive index inorganic material ultrafine particle embedding resin composition, a fluororesin material represented by 3-fluoroethyl acrylate, etc., and polymethyl methacrylate
  • a bandpass filter 2 can be formed by using a low-refractive-index resin material such as an acryl resin represented by a rate and laminating these materials having different refractive indexes on a transparent base material.
  • a band-pass filter is formed using a liquid crystal polymer material
  • a thin film having a cholesteric helical structure and obtaining selective reflection is formed on a transparent substrate by using a lyotropic liquid crystal / thermotropic liquid crystal.
  • the thin film is subjected to processes such as UV polymerization, drying, and heat curing to fix the structure and form a bandpass filter.
  • the material of the transparent substrate used in the above (1) to (3) is not particularly limited, but generally, a polymer or a glass material is used.
  • the polymer include cell-based polymers such as cellulose acetate and cellulose acetate, polyester polymers such as polyethylene terephthalate and polyethylene naphthalate, and polyolefin-polycarbonate polymers.
  • a so-called reflective polarizer (which reflects light having a polarization plane orthogonal to the polarization plane of the polarizer disposed on the backlight side of the liquid crystal cell 3) is provided between the bandpass filter 2 and the backlight 1.
  • a so-called reflective polarizer which reflects light having a polarization plane orthogonal to the polarization plane of the polarizer disposed on the backlight side of the liquid crystal cell 3.
  • a film such as Zeonor.
  • the bandpass filter 2 is used as a light-emitting spectrum of the backlight 1.
  • the maximum transmittance is shown at the wavelength corresponding to the peak wavelength in the spectrum (the wavelength showing the maximum transmittance is called the maximum transmission wavelength). (Wavelength that is 50% or more).
  • the parallelism of light transmitted through the band-pass filter 2 is different, and the difference can be set arbitrarily according to the purpose. Can be.
  • the reflection wavelength with a cut rate of 50% or more according to the incident angle 0 of the light to the bandpass filter 2 is approximately derived by the following equation (1).
  • ⁇ 2 ⁇ 1 X (1-(n 0 / ne) 2 xsi ⁇ 2 1/2 ⁇ (1)
  • ⁇ 1 is the value of the reflection wavelength that reflects normal incident light by 50% or more
  • ⁇ 2 is the value of the reflection wavelength that reflects light at an incident angle ⁇ of 50% or more
  • ⁇ 0 is the refractive index of the external medium (1.0 in the case of the air interface)
  • ne is the effective refraction 0 indicates the incident angle.
  • the reflection wavelength ⁇ 1 555 nm
  • the incident angle ⁇ is outside the range of about 22 degrees, ⁇ 2 ⁇ 545 ⁇ , and the light having a peak wavelength of 545 nm of the backlight 1, which is on the longer wavelength side than ⁇ 2, does not pass through the bandpass filter 2 by 50% or more.
  • the reflection wavelength ⁇ 1 547 nm
  • the reflection wavelength ⁇ 1 545.5 nm
  • the parallelism of light transmitted through the bandpass filter 1 can be freely set. Can be controlled.
  • a backlight 1 using a three-wavelength cold-cathode tube as a light source often has peak wavelengths of 435 nm for blue light, 545 nm for green light and 610 nm for red light, and each peak
  • the reflection wavelength ⁇ 1 of the bandpass filter 2 may be set according to the wavelength.
  • the reflection wavelength ⁇ 43 is set to 436 : 6 nm for blue light, 547 nm for green light, and 612.3 nm for red light, regardless of color
  • the angle of incidence> is about ⁇ 10 degrees. That is, it is possible to control the parallelism of the light transmitted through the bandpass filter 2 within a range of ⁇ 10 degrees from the front, regardless of the color.
  • the maximum transmittance for each wavelength in the band-pass filter 2 can be changed by designing the film quality.
  • the phosphor of each color of the light source forming the backlight 1 is required.
  • To adjust the blending amount of the light source, or to provide a backlight 1 suitable for the maximum transmittance for each wavelength, or to supply a light source (a plurality of light emitting diodes) forming the pack light 1 to each light emitting diode By adjusting the power, it is possible to make the emission spectrum intensity of the backlight 1 suitable for the maximum transmittance for each wavelength described above.
  • the angle characteristic of the selective reflection in the cholesteric liquid crystal is as described in Japanese Patent Application No. 2000-2005.
  • the wavelength band ⁇ of the light that is selectively reflected is derived from the following expression (3) by the difference ⁇ in the average refractive index of the cholesteric liquid crystal.
  • ⁇ indicates the pitch interval of the cholesteric liquid crystal helical structure
  • 0 indicates the incident angle
  • a predetermined diffusion plate (not shown) is preferably disposed between the bandpass filter 2 and the knock light 1. If the diffusion plate is arranged, the band pass fill The light obliquely incident on evening 2 and the reflected light is scattered by the diffuser, and a part of the scattered light (the component that is perpendicularly incident on the bandpass filter evening 2) can be reused. It is possible to increase the use efficiency of the light emitted from the light 1.
  • a diffusion plate can be formed by embedding fine particles having different refractive indices in a resin or the like, in addition to the one having a function of diffusing light by forming an uneven shape on the surface. .
  • the diffusion plate and the backlight 1 are arranged close to each other, Newton rings may be generated due to interference of light in a gap between the diffusion plate and the backlight 1. Therefore, if the diffusion plate is formed so that the surface on the side facing the backlight 1 has an uneven shape, the generation of the Newton ring is suppressed, and the quality of the pack light 1 can be maintained.
  • a layer having both a surface unevenness for suppressing Newton's ring generation and a light diffusion function may be formed on the surface of the bandpass filter 2 on the side of the packlight 1.
  • the bandpass filter 2 can exert its optical function regardless of whether it is attached to the liquid crystal cell 3 or the backlight 1.
  • the optical function surface of the bandpass filter 2 (the surface opposite to the base material side) is attached to the liquid crystal cell 3 via an adhesive or an adhesive, while the base material of the bandpass filter 2 is exposed to the air interface.
  • the optical function surface can be protected.
  • the optical function surface can be similarly protected by attaching the optical function surface to the backlight 1 via an adhesive or an adhesive.
  • T i ⁇ 2 ZS i ⁇ 2 vapor-deposited thin film is laminated with fifteen layers of 50 m thick polyethylene terephthalate film at the design values shown in Table 1 (total thickness is about 53 u rn).
  • a bandpass filter having the transmission spectral characteristics shown in FIG. 2 was manufactured. Table 1
  • a diffuser plate was placed on the light guide that constitutes a normal omnidirectional backlight (the emission spectrum of the cold cathode light source used is shown in Fig. 2).
  • ⁇ The bandpass filter was placed on top of that. However, it was found that the light transmitted through the bandpass filter became parallel light near the front of ⁇ 20 degrees.
  • the optical system was combined with a TFT liquid crystal panel having a viewing angle characteristic shown in FIG. More specifically, in consideration of handling characteristics, an acrylic adhesive (Nitto Denko No. 7, thickness 25 m). By sticking the vapor-deposited surface to the liquid crystal panel in this way, the occurrence of scratches on the vapor-deposited surface and the like were prevented, and the handling was improved.
  • an acrylic adhesive Nito Denko No. 7, thickness 25 m
  • a light-diffusing adhesive with a haze of 88% (a front diffuser made by Nitto Denko, thickness approx. 30 im (acrylic adhesive material (refractive index: 1.47) with Si02-based spherical particles ⁇ 4 m dispersed))).
  • Fig. 3 shows the viewing angle characteristics of the liquid crystal display device thus obtained. As shown in Fig. 3, it was found that the viewing angle was expanded and the good viewing area was expanded.
  • Fluorine-based acrylate resin (LR 202B manufactured by Nissan Chemical Industries, Ltd.) is used as the low-refractive-index resin material, and acrylate resin containing inorganic high-refractive-index ultra-fine particles (desoleite manufactured by JSR) is used as the high-refractive-index resin material.
  • a TAC film (TD-TAC) manufactured by Fuji Film Co., Ltd., a total of 21 layers were laminated with the design values shown in Table 2 by multi-layer thin film coating to produce a bandpass filter having the transmission spectral characteristics shown in Fig. 4. .
  • an acryl-based hard coat resin containing fine spherical melamine resin fine particles of ⁇ 4 ⁇ is applied to a surface of the bandpass filter on the backlight side, and a surface irregularity shape for suppressing generation of newton ring, A layer having a diffusion function was formed.
  • the layer it is not necessary to dispose a diffusion plate on the backlight side, the surface hardness of the band bath filter is improved, and the handling characteristics are remarkably improved.
  • the band-pass filter When the band-pass filter was placed on a normal omnidirectional backlight, the light transmitted through the band-pass filter was collimated near the front of ⁇ 20 degrees, as in Example 1, and was excellent from the liquid crystal cell. It was possible to extract light only from the appropriate display area.
  • a 30 m pitch prism sheet array was arranged on the display surface side of the liquid crystal cell as a means for expanding the viewing angle.
  • the prism sheet array is arranged with an inclination of about 15 degrees in order to prevent generation of moire fringes between the matrix and the black matrix. did.
  • the arrangement of the viewing angle enlarging means only needs to consider the relationship with the black matrix, so that the arrangement can be easily determined and a good display quality without gradation inversion within a range of ⁇ 50 degrees. I got it.
  • Onm for the emission spectrum of the 435 nm, 545 nm, and 610 nm of the three-wavelength cold cathode tube Circularly polarizing film 1 was produced.
  • a PET film having a thickness of 75 was used as a substrate on which the polymer was applied. On the surface of this substrate,? Eight layers were coated about 0.1 m and rubbed with rayon rubbing cloth.
  • the polymer was applied as a 10% by weight solution in methylene chloride to the base material with a wire par so that the thickness when dried was about 1. After coating, it was dried at 140 ° C for 15 minutes. After the completion of the drying treatment, the liquid crystal was cooled and fixed at room temperature to obtain a liquid crystal thin film.
  • a liquid crystal thin film corresponding to each selective reflection center wavelength is produced through the steps described above, and bonded together with an isocyanate-based adhesive to form a PET film.
  • the liquid crystal thin film was appropriately removed, and finally, three layers of each liquid crystal thin film were laminated in order from the short wavelength side to produce a selective reflection circularly polarizing film 1 having a liquid crystal composite layer having a thickness of about 5 / m.
  • FIG. 7 shows the transmission spectral characteristics of the selective reflection circularly polarizing film 1 manufactured as described above.
  • a NI POCS film (PCF400) manufactured by Nitto Denko Corporation was used as the film 2 that reflects left-handed circularly polarized light.
  • Such a film is a circularly-polarized reflective polarizing plate usually used for the purpose of improving brightness.
  • the film 1 and the film 2 were laminated, laminated with a quarter-wave plate, and further laminated so that the polarizing plate and the transmission axis coincided with each other.
  • the bandpass filter that is, the use of circular dichroism
  • the light use efficiency of the backlight was improved about 1.5 times as compared with the first and second embodiments.
  • liquid A viewing angle-enlarging functional film that does not substantially cause back scattering of 88% haze is laminated on the display surface side of the crystal cell, and the light emitted from the band-pass filter is transmitted, so that the And good display quality without uniform grayscale inversion could be obtained.
  • Example 2 a fine-filled microlens type viewing angle widening film of ⁇ 100 was laminated. Since moire fringes were generated between the lens of the viewing angle widening film and the black matrix of the liquid crystal display device, the sticking angle of the viewing angle widening film was rotated to remove moire fringes. Also in this example, no moire fringes or interference fringes were generated between the bandpass filter and the bandpass filter as the parallel light means, and good display quality was obtained.
  • the light emitted from the backlight was collimated using a micro-beam type collimating film (width of each light shielding louver: 13 im, spacing: 250 urn).
  • the total thickness after laminating two films whose arrangement directions are orthogonal to each other was 1.4 mm, and the light transmitted through the film was turned into a parallel light near ⁇ 10 degrees in front of the front.
  • a viewing angle widening film composed of a ⁇ 100 m microlens array film was arranged on the display surface side of the liquid crystal cell.
  • a prism array having a pitch of 50 m was used as the parallel light converting means.
  • a viewing angle widening film composed of a ⁇ 100 m microlens array film was arranged on the display surface side of the liquid crystal cell.
  • a collimating unit that emits light that is collimated with respect to the liquid crystal cell, and diffuses light transmitted through the liquid crystal cell to increase the viewing angle.
  • a liquid crystal display device having a wide viewing angle is provided because of the provision of the viewing angle expanding means for expanding the viewing angle.
  • moiré fringes and the like are generated between the collimating means and the regular pattern structure of other optical members (liquid crystal cell, viewing angle enlarging means, etc.) constituting the liquid crystal display device.
  • the collimating means is a bandpass filter
  • the bandpass filter is formed by laminating vapor-deposited materials in multiple layers, moire fringes, interference fringes, and the like are generated between the bandpass filter and a regular pattern structure of other optical members constituting the liquid crystal display device. It does not have a regular pattern structure that can be caused.
  • the evaporation material and the like can be made thinner, the thickness of the bandpass filter can be made thinner, and the liquid crystal display device can be made thinner.

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Liquid Crystal (AREA)
  • Optical Elements Other Than Lenses (AREA)

Abstract

L'invention concerne un unité d'affichage à cristaux liquides comprenant un rétroéclairage (1), un moyen de parallélisme d'éclairage (2) destiné à rendre parallèles des faisceaux de lumière incidents à partir du rétroéclairage (1) à émettre en sortie, et une cellule de cristaux liquides (3) destinée à laisser la sortie des faisceaux de lumière en provenance du moyen de parallélisme de lumière (2) la traverser, et un moyen d'élargissement (4) de l'angle de visualisation destiné à diffuser les faisceaux de lumière ayant traversé la cellule de cristaux liquides (3), afin d'élargir un angle de visualisation, caractérisée en ce que le moyen de parallélisme de lumière (2) ne présente pas de structure à motif régulier capable de produire une frange de moiré ou une frange d'interférence entre lui et la structure à motif régulier d'un autre élément optique constituant une unité d'affichage à cristaux liquides (10).
PCT/JP2003/002984 2002-03-14 2003-03-13 Unite d'affichage a cristaux liquides WO2003077017A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US10/507,120 US20050206804A1 (en) 2002-03-14 2003-03-13 Liquid crystal display unit

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2002070183 2002-03-14
JP2002-70183 2002-03-14

Publications (1)

Publication Number Publication Date
WO2003077017A1 true WO2003077017A1 (fr) 2003-09-18

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US (1) US20050206804A1 (fr)
CN (1) CN1613027A (fr)
WO (1) WO2003077017A1 (fr)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7078712B2 (en) * 2004-03-18 2006-07-18 Axcelis Technologies, Inc. In-situ monitoring on an ion implanter
US7352006B2 (en) * 2004-09-28 2008-04-01 Goldeneye, Inc. Light emitting diodes exhibiting both high reflectivity and high light extraction
US20080303783A1 (en) * 2007-06-07 2008-12-11 Weibezahn Karl S Touchless detection display
US8953118B2 (en) 2009-11-30 2015-02-10 Nitto Denko Corporation Liquid crystal display apparatus
JP5482199B2 (ja) * 2009-12-28 2014-04-23 ソニー株式会社 撮像装置
KR101721889B1 (ko) 2010-08-06 2017-03-31 삼성전자주식회사 능동형유기발광다이오드 표시장치 및 그의 표시제어방법
KR20130129675A (ko) 2012-05-21 2013-11-29 삼성디스플레이 주식회사 표시판 및 이를 포함하는 표시 장치
KR20150057160A (ko) * 2013-11-18 2015-05-28 삼성디스플레이 주식회사 젤로 이루어진 코팅층을 포함하는 표시장치, 그 제조방법 및 표시장치 수리방법
CN106681042B (zh) * 2017-01-05 2021-01-26 京东方科技集团股份有限公司 触控显示屏及其制造方法、触控显示装置
DE112018005766B4 (de) * 2017-11-07 2021-10-07 Fujifilm Corporation Bildbelichtungsvorrichtung
CN109355629B (zh) * 2018-11-27 2020-12-11 杭州科汀光学技术有限公司 一种薄膜滤光片的低温制备方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0777691A (ja) * 1993-08-20 1995-03-20 Sextant Avionique 偏光光源体
JPH09113904A (ja) * 1995-10-20 1997-05-02 Hitachi Ltd 液晶表示装置およびその拡散板
EP1059556A2 (fr) * 1999-06-07 2000-12-13 Nitto Denko Corporation Couche de diffusion de la lumière
US6307604B1 (en) * 1992-07-04 2001-10-23 U.S. Philips Corporation Light source having a luminescent layer

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4984872A (en) * 1989-06-16 1991-01-15 Rockwell International Corporation Wide viewing angle avionics liquid crystal display
US6573961B2 (en) * 1994-06-27 2003-06-03 Reveo, Inc. High-brightness color liquid crystal display panel employing light recycling therein
JP3168010B2 (ja) * 1995-04-11 2001-05-21 リトン・システムズ・インコーポレーテッド 日光の中でも判読可能な液晶ディスプレイ
JP3844886B2 (ja) * 1998-07-28 2006-11-15 富士通株式会社 光フィルタの製造方法
US20010038425A1 (en) * 1998-08-04 2001-11-08 James Y. Lee Backlight assembly for a display device
JP3893533B2 (ja) * 2001-02-09 2007-03-14 株式会社日立製作所 液晶表示装置
EP1306717A1 (fr) * 2001-10-24 2003-05-02 Rolic AG Filtre de couleur commutable
US7046320B2 (en) * 2002-03-14 2006-05-16 Nitto Denko Corporation Optical element and surface light source device using the same, as well as liquid crystal display
US20040090577A1 (en) * 2002-03-20 2004-05-13 Kazutaka Hara Bandpass filter for a liquid crystal display, liquid crystal display using the bandpass filter and method of manufacturing the bandpass filter

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6307604B1 (en) * 1992-07-04 2001-10-23 U.S. Philips Corporation Light source having a luminescent layer
JPH0777691A (ja) * 1993-08-20 1995-03-20 Sextant Avionique 偏光光源体
JPH09113904A (ja) * 1995-10-20 1997-05-02 Hitachi Ltd 液晶表示装置およびその拡散板
EP1059556A2 (fr) * 1999-06-07 2000-12-13 Nitto Denko Corporation Couche de diffusion de la lumière

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US20050206804A1 (en) 2005-09-22

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